SCI7631MKA 查看數據表（PDF） - Seiko Epson Corp

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SCI7631MKA

POWER SUPPLY IC - DC/DC Switching Regulators

Seiko Epson Corp 

SCI7630 Series

Output voltage adjustment

To ensure stable output, any circuit that adjusts the out-

put voltage must contain C1, RA and RB. To stop

switching current from affecting VO, the circuit must

also satisfy the condition IO < IR.

VSW

VI

VO

SCI7631M

GND

Step-up

voltage

output

RA

IO

IR

CL

C RB

(IO < IR)

The following figure summarizes the relevant circuits

inside an SCI7630 series chip.

VO is connected to the level shift and buffer circuit,

which provide the gate bias for the switching transistor

driving the inductor. The current drain, IO1, varies with

the load and is typically 10µA. The current, IO2,

through the internal resistors R1 and R2, is typically

1µA.

VI

VSW

IO1

IO

VO

IO2

R1

Comparatpr

Buffer

Level

shifter

Controller

VREF R2

Voltage adjustment

circuit

SCI7633 Series CMOS Switching Regulators

DESCRIPTION

The SCI7633 series of CMOS switching regulators pro-

vide input voltage step-up and regulation to a specified

voltage using an external coil. The devices in these se-

ries incorporate precision, low-power reference voltage

generators and transistors for driving an internal com-

parator. They feature low power consumption, low op-

erating voltages and standby operation.

The devices offer a range of fixed output voltages, from

2.35 to 5.00V.

They are available in 8-pin SOP3s.

APPLICATIONS

• Fixed-voltage power supplies for battery-operated

equipment such as portable video cassette recorders,

video cameras and radios

• Power supplies for pages, memory cards, calculators

and similar hand-held equipment

• Fixed-voltage power supplies for medical equipment

• Fixed-voltage power for communications equipment

• Power supplies for microcomputers

• Uninterruptable power supplies

FEATURES

• 0.9V (Min.) operating voltage

• 8µA (Typ.) maximum current consumption

• Standby operation

• 3µA (Typ.) standby current consumption

• Built-in oscillator circuit for use with external crystal

oscillator

• 8-pin SOP3

SCI7000 Series

Technical Manual

EPSON

4–21

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